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Twin-Path® Synthetic
Roundsling Boom Pendants
2
Slingmax® Rigging Solutions (North America)
36 Fabrication / Repair / Testing Facilities
Twin-Path® Boom Pendants
Slingmax® International Locations
8 Fabrication/Repair Stations
Twin-Path® Boom Pendants
Crosby Open Socket
Crosby Closed Socket
Crosby Open Socket
Crosby Closed Socket
Boom Pendant Assembly
Rated for 15 metric tons – 5/1 D/F
Twin-Path® High Performance
Roundsling (K-Spec® Core Yarn)
NOTICE
THIS DOCUMENT REMAINS THE PROPERTY OF THE CROSBY GROUP, INC THIS
DRAWING, PRINT OR DOCUMENT AND THIS INFORMATTION DISCLOXED BY IT ARE
PROPIETORY ITEMS TO WHICH THE CROSBY GROUP, INC. RETAINS THE
EXCLUSIVE RIGHT OF DISSAMENATION, RESPRODUCTION, MANUFACTURE AND
SALE. THIS DRAWING, PRINT OR DOCUMENT IS LOANED IN CONFIDENCE, TO THE
RECIPIENT ONLY AND SHALL BE RETURNED UPON DEMAND. FURTHER
DISCLOSURE OF THIS DRAWING, PRINT OR DOCUMENT,OR INFORMATION
DISCLOSED BY IT IS NOT PERMITTED UNLESS AUTHORIZATION IS EXPRESSLY
GRANTED IN WRITING BY CROSBY GROUP, INC.
Twin-Path® Boom Pendants
3.5-inch bearing area
Boom Pendant Assembly
Rated for 15 metric tons – 5/1 D/F
NOTICE
THIS DOCUMENT REMAINS THE PROPERTY OF THE CROSBY GROUP, INC THIS
DRAWING, PRINT OR DOCUMENT AND THIS INFORMATTION DISCLOXED BY IT ARE
PROPIETORY ITEMS TO WHICH THE CROSBY GROUP, INC. RETAINS THE
EXCLUSIVE RIGHT OF DISSAMENATION, RESPRODUCTION, MANUFACTURE AND
SALE. THIS DRAWING, PRINT OR DOCUMENT IS LOANED IN CONFIDENCE, TO THE
RECIPIENT ONLY AND SHALL BE RETURNED UPON DEMAND. FURTHER
DISCLOSURE OF THIS DRAWING, PRINT OR DOCUMENT,OR INFORMATION
DISCLOSED BY IT IS NOT PERMITTED UNLESS AUTHORIZATION IS EXPRESSLY
GRANTED IN WRITING BY CROSBY GROUP, INC.
Twin-Path® Boom Pendants
Why Twin-Path Slings for Boom Pendants?
Less weight (4 x’s lighter)
Save $ on over the road
costs
Simple Sling Inspection
Patented “Check-Fast®”
inspection system
Reusable Crosby End
Fittings
Shock absorber (dampening
effect)
No maintenance (no lube)
Won’t rust, excellent
chemical resistance
Repairable / All proof tested
Exact length tolerances
Won’t emit static charge
Twisting is no problem
Service life 3-5x’s longer
Can change bearing points
to extend service life
Store in job box / cab
Longer lengths (60’) less
fittings = less $ and weight
Over 20 years success in
field
Used by Nuclear, Military,
refineries, everywhere.
Worldwide service centers
Best covers, best core yarn
and best / only internal
inspection device
Can start right away
Twin-Path® Boom Pendants
Proven Safety Record
(25 years & Counting)
Twin-Path® Slings first
introduced in 1988.
First roundsling in the
world to contain “High
Performance” Fiber
Previously, all were
polyester
Slingmax® is the first in
the world to use a
blended fiber for tension
member (K-Spec)
500 ton Steam
Generator Replacement
Twin-Path® Boom Pendants
Advantages of Twin-Path®
Boom Pendants
Each sling rated for 50-Tons x 20ft. Length.
44 lbs. 400 lbs.
Twin-Path® Boom Pendants
Twin-Path 1/4 the Weight of Wire
20-ft. Twin-Path® Sling
16-Ton VRC- 5/1 - D/F
.72 lbs / ft.
20 ft. length= 14.4 lbs.
Fittings presumably lighter
20-ft. length 1.25” EIP
(IWRC Wire Rope)
16 Ton VRC - 5/1 - D/F
2.89 lbs. / ft.
20 ft. length = 57.8 lbs.
Fittings presumably heavier
(resin / Wirelock, swaged)
Twin-Path® Boom Pendants
Reduced Transportation Costs
(These are 100’ long slings- 50-Ton VRC)
Twin-Path® Slings
are flatter, can be
rolled to fit into
smaller containers-
Helicopters
Easier to transport,
connect, use and
store.
Twin-Path® Boom Pendants
Advantages of Twin-Path®
Boom Pendants
Can be made to exact
length tolerances
regardless of capacity.
Less than 1% stretch
at capacity.
(Same as wire rope)
Twin-Path® Boom Pendants
- They don’t rust
Impervious to sea
water and most
chemicals including
acids
- No maintenance
- No lubrication
US Navy Raising
“Gun Turret” from
“US Monitor”-
Advantages of Twin-Path®
Boom Pendants
Twin-Path® Boom Pendants
Advantages – Twin-Path® Boom Pendants Chemical Resistance
Chemical Resistance of K-Spec® Core Yarn
Available only in Twin-Path® Extra Slings
Strength Retention After Chemical Immersion of K-Spec® Core Yarn
Seawater ………………………………………………………………..….….….. 100 % 100%
Hydraulic Fluid ………………………………………………..……….…….…... 100 % 100%
Kerosene …………………………………………….…………………..….…….. 100 % 100%
10% Detergent Solution …………………………………….…………..……… 100 % 100%
Gasoline ………………………………………………………….…….….……… 100 % 100%
Toluene …………………………………………………….…………….….…….. 100 % 96%
Glacial Acetic Acid ………………………………………………….….…....….. 100 % 100%
1M Hydrochloric Acid ……………………………………….……….…….…… 100 % 100%
5M Sodium Hydroxide ………………………………….…………....…….…… 100 % 100%
Ammonium Hydroxide (29%) ……………………………….……….…….……100 % 100%
Perchloroethylene ………………………………………….……………….…… 100 % 100%
Clorox Bleach …………………………………………….………….…………… 91 % 73%
Hypophosphite Solution (10%) ………………………….……….……………. 100 % *No Data
Nitric Acid (50% by Volume) ……………………………….…………….…….. 97 % *No Data
Sulfuric Acid (50% by Volume) …………………………..….…………………. 100 % *No Data
Phosphoric Acid (50% by Volume) ………………………………..………….. 95 % *No Data
6 Mos. 2 Yrs.
Twin-Path® Boom Pendants
14
Twin-Path® Slings will not emit static charge
Reduced Conductivity
45-Ton Space
Shuttle Booster
Advantages of Twin-Path®
Boom Pendants
Twin-Path® Boom Pendants
15
Twin-Path® Sling Twist
Testing- 2002
Breaking strength increases
up to 1.0 twists per ft.
Connect pendants on plane every time.
(can twist to make connection)
Twin-Path® Boom Pendants
Twin-Path® Sling Twist Testing – 2002 Breaking strength increased up to
1.0 twists per ft.
PHOTOGRAPH #7 TPXC 1000 SLING IN TESTING MACHINE WITH 2 TWISTS IN 5’
PHOTOGRAPH #8 TPXC 1000 SLING AFTER TESTING – TWISTS IN 5’
Advantages – Twin-Path® Boom Pendants (Can twist to make connection)
Twin-Path® Boom Pendants
Roundsling Cover Abrasion Testing
Twin-Path® Boom Pendants
Sling Cover Abrasion Test Results
Video of this testing is
available upon request.
Twin-Path® Boom Pendants
Crosby Cycle Testing 2006
Technical Bulletin #9 on Website
TP sling rated for 25,000 lbs. pulled to
37,500 lbs. over Crosby 1-3/8” Shackle
Bows .
50,000 cycles at 50% overload.
50,000 cycles = 1 lift per hour, every
hour, every day for 6 years.
Twin-Path® Boom Pendants
Bearing Points Never Changed.
After testing, slings still passed
inspection.
Inspection devices still operable.
Slings then broken on shackle
bows- reached over 4:1 D/F.
Wire rope tested over 2” straight
pins in separate testing broke at
bearing point after 25,000 cycles.
Advantages – Twin-Path® Boom Pendants Fatigue and Abrasion Resistance
Close-up of tag on sling being tested Photograph of the slings once testing is completed
Photograph of the inside end of sling after cycle testing has been completed
Sling #2 after ultimate load testing
Close-up of each end of sling #2 after ultimate testing Twin-Path® Boom Pendants
Synthetic Roundslings
Ultra-Violet (UV) Degradation
Which covers best protect from UV Degradation?
DBL Purple Poly DBL Black Poly DBL Green Poly DBL Yellow Poly
DBL Gray Poly DBL Red Poly DBL Brown Poly DBL Blue Poly
DBL Orange Poly CoverMax® Green SGL Clear Poly SGL Gray Bulk Nylon
Twin-Path® Boom Pendants
Fiber Type
No UV Exposure
No Cover
Clear Cover
DBL Yellow Poly Cover
DBL Org-Red Poly Cover
DBL Black Poly Cover
CoverMax® Cover
Baseline Percentage of Strength LOST at 500 Hours of UV Exposure to Covers/Fiber
Polyester 100% 36% 46% 12% 9% 5% 2%
Aramid 100% 28% 38% 26% 27% 9% 2%
K-Spec® 100% 12% N/A N/A N/A N/A 1.13%
Twin-Path® slings do not lose strength due to UV exposure
Most all other roundslings in the world do lose strength when exposed to UV- some
up to 40% or more.
Synthetic Roundslings Slingmax® UV Degradation Testing Results
Advantages – Twin-Path® Boom Pendants UV Degradation Resistance
Twin-Path® Boom Pendants
Southern Weaving UV Quick Test
Picture is yellow 9800GN nylon web sling material protected by Slingmax®
Covermax® roundsling tubing.
The exposed webbing faded to white after 334 hours of UV exposure. When
the nylon web was pulled out of the protective Slingmax® cover, you can see
the original yellow color remains. It shows no UV degradation to the
protected webbing.
Advantages – Twin-Path® Boom Pendants UV Degradation Resistance
Twin-Path® Boom Pendants
Rifled Cover - US Patents # 7,926,859 & #8,322,765
Helically laid (rope-like) core adds
15% higher breaking strength vs.
parallel laid core yarns.
Twin-Path® Boom Pendants
Check-Fast® Inspection
US Patent # 7,661,737
Warning indicator reacts at a
pre-determined force well before
damage can occur to the load
bearing core.
Provides a visual warning.
Provides an audible warning.
Can determine overload.
Can determine abrasion/fatigue
damage.
Pre-failure Warning Indicator for Roundslings
Twin-Path® Boom Pendants